Suzuki Swift warm air small water tank blocked. Is coke useful?

It doesn't work. Cola is a kind of beverage, which contains corrosive substances such as sodium cyclamate. Suzuki Swift's small heater is blocked and can't be cleaned with coke. If it is used to remove the scale and rust in the water tank, it will cause metal corrosion in the water tank, which is not conducive to the use of the water tank, and it is easy to stick the impurities in the water tank together, resulting in poor water flow in the water tank.